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                                <div id="anchor-navigation-ex-navbar"><i class="fa fa-navicon"></i><ul><li><span class="title-icon "></span><a href="#aac&#x8BE6;&#x89E3;"><b>1. </b>AAC&#x8BE6;&#x89E3;</a></li><ul><li><span class="title-icon "></span><a href="#adts--audio-data-transport-stream"><b>1.1. </b>ADTS  (Audio Data Transport Stream)</a></li><li><span class="title-icon "></span><a href="#aac&#x6570;&#x636E;&#x6D41;&#x683C;&#x5F0F;"><b>1.2. </b>aac&#x6570;&#x636E;&#x6D41;&#x683C;&#x5F0F;</a></li><li><span class="title-icon "></span><a href="#adts-heads"><b>1.3. </b>ADTS Heads</a></li></ul></ul></div><a href="#aac&#x8BE6;&#x89E3;" id="anchorNavigationExGoTop"><i class="fa fa-arrow-up"></i></a><h1 id="aac&#x8BE6;&#x89E3;"><a name="aac&#x8BE6;&#x89E3;" class="anchor-navigation-ex-anchor" href="#aac&#x8BE6;&#x89E3;"><i class="fa fa-link" aria-hidden="true"></i></a>1. AAC&#x8BE6;&#x89E3;</h1>
<h2 id="adts--audio-data-transport-stream"><a name="adts--audio-data-transport-stream" class="anchor-navigation-ex-anchor" href="#adts--audio-data-transport-stream"><i class="fa fa-link" aria-hidden="true"></i></a>1.1. ADTS  (Audio Data Transport Stream)</h2>
<pre><code class="lang-xml">&#x6709;&#x7684;&#x65F6;&#x5019;&#x5F53;&#x4F60;&#x7F16;&#x7801;AAC&#x88F8;&#x6D41;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x4F1A;&#x9047;&#x5230;&#x5199;&#x51FA;&#x6765;&#x7684;AAC&#x6587;&#x4EF6;&#x5E76;&#x4E0D;&#x80FD;&#x64AD;&#x653E;&#xFF0C;
&#x5F88;&#x5927;&#x7684;&#x53EF;&#x80FD;&#x5C31;&#x662F;AAC&#x6587;&#x4EF6;&#x7684;&#x6BCF;&#x4E00;&#x5E27;&#x91CC;&#x7F3A;&#x5C11;&#x4E86;ADTS&#x5934;&#x4FE1;&#x606F;&#x6587;&#x4EF6;&#x7684;&#x5305;&#x88C5;&#x62FC;&#x63A5;&#x3002;
&#x53EA;&#x9700;&#x8981;&#x52A0;&#x5165;&#x5934;&#x6587;&#x4EF6;ADTS&#x5373;&#x53EF;&#x3002;
</code></pre>
<p><br></p>
<h2 id="aac&#x6570;&#x636E;&#x6D41;&#x683C;&#x5F0F;"><a name="aac&#x6570;&#x636E;&#x6D41;&#x683C;&#x5F0F;" class="anchor-navigation-ex-anchor" href="#aac&#x6570;&#x636E;&#x6D41;&#x683C;&#x5F0F;"><i class="fa fa-link" aria-hidden="true"></i></a>1.2. aac&#x6570;&#x636E;&#x6D41;&#x683C;&#x5F0F;</h2>
<p><img src="https://gitee.com/hnyer/filesOfGitbook/raw/master/files/201808141719_osChina_AAC&#x6570;&#x636E;&#x6D41;&#x683C;&#x5F0F;.png" alt=""></p>
<pre><code class="lang-xml">AAC ES : Elementary Streams (&#x539F;&#x59CB;&#x6D41;)
</code></pre>
<p><br></p>
<h2 id="adts-heads"><a name="adts-heads" class="anchor-navigation-ex-anchor" href="#adts-heads"><i class="fa fa-link" aria-hidden="true"></i></a>1.3. ADTS Heads</h2>
<pre><code class="lang-xml">ADTS&#x7684;&#x5934;&#x4FE1;&#x606F;&#x90FD;&#x662F;7&#x4E2A;&#x5B57;&#x8282;&#xFF0C;&#x5206;&#x4E3A;2&#x90E8;&#x5206;&#xFF1A;
adts_fixed_header(); // 28bit
adts_variable_header(); // 28bit
</code></pre>
<table>
<thead>
<tr>
<th>adts_fixed_header&#x7684;&#x5B57;&#x6BB5;</th>
<th>&#x5360;&#x7528;bit&#x6570;</th>
<th>&#x610F;&#x4E49;</th>
</tr>
</thead>
<tbody>
<tr>
<td>syncword</td>
<td>12</td>
<td>&#x540C;&#x6B65;&#x5934; &#x603B;&#x662F;0xFFF &#x3002;&#x4EE3;&#x8868;&#x7740;&#x4E00;&#x4E2A;ADTS&#x5E27;&#x7684;&#x5F00;&#x59CB;</td>
</tr>
<tr>
<td>ID</td>
<td>1</td>
<td>MPEG Version <br>0 &#x4EE3;&#x8868; MPEG-4, 1&#x4EE3;&#x8868; MPEG-2</td>
</tr>
<tr>
<td>Layer</td>
<td>2</td>
<td>always: &apos;00&apos;</td>
</tr>
<tr>
<td>protection_absent</td>
<td>1</td>
<td>Warning, 1:&#x6CA1;&#x6709;CRC , 0:&#x6709;CRC</td>
</tr>
<tr>
<td>profile</td>
<td>2</td>
<td>&#x4F7F;&#x7528;&#x7684;AAC&#x7EA7;&#x522B; <br> 0: main profile  <br>1:low complexity profile (LC)  <br>2: scalable sampling rate profile (SSR)  <br>3:&#x4FDD;&#x7559;&#x5B57;&#x6BB5; reserved</td>
</tr>
<tr>
<td>sampling_frequency_index</td>
<td>4</td>
<td>&#x4F7F;&#x7528;&#x7684;&#x91C7;&#x6837;&#x7387;&#x4E0B;&#x6807;<br>// &#x4E0B;&#x6807;&#x5BF9;&#x5E94; &#x7684;&#x91C7;&#x6837;&#x7387; <br>0: 96000 Hz <br>1: 88200 Hz <br>2: 64000 Hz <br>3: 48000 Hz <br>4: 44100 Hz <br>5: 32000 Hz <br>6: 24000 Hz <br>7: 22050 Hz <br>8: 16000 Hz <br>9: 12000 Hz <br>10: 11025 Hz <br>11: 8000 Hz <br>12: 7350 Hz <br>13: Reserved <br>14: Reserved <br>15: frequency is written explictly</td>
</tr>
<tr>
<td>private_bit</td>
<td>1</td>
<td>&#x56FA;&#x5B9A;&#x4E3A;0</td>
</tr>
<tr>
<td>channel_configuration</td>
<td>3</td>
<td>&#x58F0;&#x9053;&#x6570;<br>0: Defined in AOT Specifc Config <br>1: 1 &#x58F0;&#x9053;: front-center <br>2: 2 &#x58F0;&#x9053;: front-left, front-right <br>3: 3 &#x58F0;&#x9053;: front-center, front-left, front-right <br>4: 4 &#x58F0;&#x9053;: front-center, front-left, front-right, <br> back-center <br>5: 5 &#x58F0;&#x9053;: front-center, front-left, front-right,  <br>back-left, back-right <br>6: 6 &#x58F0;&#x9053;: front-center, front-left, front-right,  <br>back-left, back-right, LFE-channel <br>7: 8 &#x58F0;&#x9053;: front-center, front-left, front-right,  <br>side-left, side-right, back-left,  <br>back-right, LFE-channel <br>8-15: &#x4FDD;&#x7559;Reserved</td>
</tr>
<tr>
<td>original_copy</td>
<td>1</td>
<td>&#x56FA;&#x5B9A;&#x4E3A;0</td>
</tr>
<tr>
<td>home</td>
<td>1</td>
<td>&#x56FA;&#x5B9A;&#x4E3A;0</td>
</tr>
</tbody>
</table>
<table>
<thead>
<tr>
<th>adts_variable_header&#x7684;&#x5B57;&#x6BB5;</th>
<th>&#x5360;&#x7528;bit&#x6570;</th>
<th>&#x610F;&#x4E49;</th>
</tr>
</thead>
<tbody>
<tr>
<td>copyright_identification_bit</td>
<td>1</td>
<td>&#x56FA;&#x5B9A;&#x4E3A;0</td>
</tr>
<tr>
<td>copyright_identification_star</td>
<td>1</td>
<td>&#x56FA;&#x5B9A;&#x4E3A;0</td>
</tr>
<tr>
<td>aac_frame_length</td>
<td>13</td>
<td>&#x4E00;&#x4E2A;ADTS&#x5E27;&#x7684;&#x957F;&#x5EA6;&#x5305;&#x62EC;ADTS&#x5934;&#x548C;raw data block</td>
</tr>
<tr>
<td>adts_buffer_fullness</td>
<td>11</td>
<td>&#x56FA;&#x5B9A;&#x4E3A;0x7ff ,&#x8BF4;&#x660E;&#x662F;&#x7801;&#x7387;&#x53EF;&#x53D8;&#x7684;&#x7801;&#x6D41;</td>
</tr>
<tr>
<td>number_of_raw_data_blocks_in_frame</td>
<td>2</td>
<td>&#x56FA;&#x5B9A;&#x4E3A;00 &#x3002;&#x8868;&#x793A;ADTS&#x5E27;&#x4E2D;&#x6709;1&#x4E2A;AAC&#x6570;&#x636E;&#x5757; <br>&#xFF08;&#x6CE8;&#x610F;&#xFF1A;&#x4E0D;&#x662F;&#x6CA1;&#x6709;AAC&#x6570;&#x636E;&#x5757;&#xFF09;</td>
</tr>
</tbody>
</table>
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